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公开(公告)号：US10585369B2
公开(公告)日：2020-03-10
申请号：US15544729
申请日：2016-01-25
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takao Sugiura
Abstract: An object of the present invention is to provide a ferrite particle having a low apparent density, filling a specified volume with a low weight with various properties maintained in a controllable state, a ferrite carrier core material composed of the ferrite particle, and a ferrite carrier using the ferrite core material and an electrophotographic developer. To achieve the object, the ferrite particle having the outer shell structure containing the Ti oxide for the ferrite carrier core material, and the ferrite carrier using the ferrite particle as the ferrite carrier core material and the electrophotographic developer are employed.
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22.发明申请公开(公告)号：US20200033746A1
公开(公告)日：2020-01-30
申请号：US16483709
申请日：2018-01-15
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charging characteristics and strength with low specific gravity and with which a satisfactory image free of defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 60 to 800 ppm in terms of a sulfate ion and a pore volume of from 30 to 100 mm3/g.
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23.发明申请公开(公告)号：US20180179082A1
公开(公告)日：2018-06-28
申请号：US15511492
申请日：2015-08-31
Inventor： Koji AGA , Tetsuya IGARASHI , Akio TAKAHASHI
CPC classification number: C01G49/0072 , C01P2002/50 , C01P2004/32 , C01P2004/51 , C01P2004/61 , C01P2006/12 , C01P2006/42 , C08K3/22 , C08K9/04 , C08K2003/2265 , C08L101/00 , C09C1/22 , C09C1/24 , H01F1/00 , H01F1/37
Abstract: The present invention provides a spherical ferrite powder that is excellent in filling ability and moldability if used as a filler, is excellent in handling ability, and is high in resistivity; a resin compound including the ferrite powder; and a molded product made of the resin compound. The spherical ferrite powder including 15 to 30 wt % of ferrite particles having the particle diameter less than 11 μm and have the volume average particle diameter of 10 to 50 μm; the resin compound including the ferrite powder; and the molded product made of the resin compound are employed.
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公开(公告)号：US20180011414A1
公开(公告)日：2018-01-11
申请号：US15544729
申请日：2016-01-25
Applicant: POWDERTECH CO., LTD.
Inventor： Koji AGA , Takao SUGIURA
Abstract: An object of the present invention is to provide a ferrite particle having a low apparent density, filling a specified volume with a low weight with various properties maintained in a controllable state, a ferrite carrier core material composed of the ferrite particle, and a ferrite carrier using the ferrite core material and an electrophotographic developer. To achieve the object, the ferrite particle having the outer shell structure containing the Ti oxide for the ferrite carrier core material, and the ferrite carrier using the ferrite particle as the ferrite carrier core material and the electrophotographic developer are employed.
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公开(公告)号：US20170349449A1
公开(公告)日：2017-12-07
申请号：US15541408
申请日：2016-01-21
Applicant: POWDERTECH CO., LTD.
Inventor： Koji AGA , Tetsuya IGARASHI
CPC classification number: C01G49/06 , C01G49/00 , C01G53/00 , C01P2004/20 , C01P2006/42 , C09C1/24 , C09C1/245 , C09D5/36 , C09D7/69 , C09D7/70 , H01F1/36 , H05K9/00 , H05K9/0026
Abstract: An object is to provide a plate shaped ferrite particle for a pigment, having both of electromagnetic wave shielding ability and designability, a resin molded material containing the plate shaped ferrite particle a pigment, and an electromagnetic wave shield housing for storing an electronic circuit manufactured by using the resin molded material. To achieve the object, the plate shaped ferrite particles for a pigment having a metallic luster, a resin molded material containing the plate shaped ferrite particles for a pigment, an electromagnetic wave shield housing for storing an electronic circuit manufactured by using the resin molded material are employed.
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Patent Agency Ranking
26.发明申请公开(公告)号：US20030186156A1
公开(公告)日：2003-10-02
申请号：US10393289
申请日：2003-03-21
Applicant: POWDERTECH CO., LTD
Inventor： Kanao Kayamoto , Issei Shinmura , Yuji Sato
IPC: G03G009/113
CPC classification number: G03G9/10 , G03G9/107 , G03G9/1075 , G03G9/1131
Abstract: A resin-coated carrier for an electrophotographic developer and a process of producing the carrier. The carrier comprises a ferrite core mainly comprising iron oxide, primarily having a spinel structure, and having a volume average particle size of 20 to 45 nullm and a resin coat, wherein the carrier has a magnetization of 65 to 80 emu/g in a magnetic field of 1 KOe, the core has an electric current value of 50 to 150 nullA and a surface smoothness uniformity of 75% or higher, and the amount of the resin coat is 0.1 to 5.0% by weight based on the core.
Abstract translation: 用于电子照相显影剂的树脂涂覆载体和制备载体的方法。 载体包括主要包含氧化铁的铁氧体磁芯，主要具有尖晶石结构，体积平均粒径为20至45μm，树脂涂层，其中载体磁化强度为65-80emu / g，磁性 1KOe的磁场，磁芯的电流值为50〜150μA，表面平滑度均匀度为75％以上，树脂涂层的含量为0.1〜5.0质量％。
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27.发明申请公开(公告)号：US20030091923A1
公开(公告)日：2003-05-15
申请号：US10173784
申请日：2002-06-19
Applicant: POWDERTECH CO., LTD.
Inventor： Hiromichi Kobayashi , Tsuyoshi Itagoshi , Takeshi Naito , Yuji Sato
IPC: G03G009/113
CPC classification number: G03G9/113 , G03G9/1136
Abstract: A resin-coated carrier to be mixed with a polymer toner obtained by suspension polymerization or emulsion polymerization to provide an electrophotographic developer, which exposes 2 to 20% of the surface area of the core thereof, the average exposed area ratio per exposed part of the core being 0.03% or less.
Abstract translation: 将树脂涂覆的载体与通过悬浮聚合或乳液聚合获得的聚合物调色剂混合以提供暴露其芯的表面积的2至20％的电子照相显影剂，每个暴露部分的平均曝光面积比 核心为0.03％以下。
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公开(公告)号：US12119151B2
公开(公告)日：2024-10-15
申请号：US17795382
申请日：2021-01-27
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takashi Kojima , Takao Sugiura , Sho Kuwahara , Satomi Konno , Tadashi Tsuduki
CPC classification number: H01F1/344 , C01G49/0072 , C01P2002/50 , C01P2004/32 , C01P2004/61 , C01P2006/40 , C01P2006/42 , C01P2006/80
Abstract: Provided are a ferrite powder capable of maintaining a high withstand voltage even when used in a resin composition having high magnetic properties and electrical resistivity and a high filling ratio, and a method for producing the same. A ferrite powder composed of spherical ferrite particles, wherein the ferrite powder contains iron (Fe): 55.0-70.0 mass % and manganese (Mn): 3.5-18.5 mass %, the ferrite powder containing more than 0.0 mass % to 7.5 mass % α-Fe2O3, and the ferrite powder has a volume average particle size (D50) of 15.0 μm or less.
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29.发明公开公开(公告)号：US20240182323A1
公开(公告)日：2024-06-06
申请号：US18553430
申请日：2022-03-08
Applicant: POWDERTECH CO., LTD.
Inventor： Tatsuto KANEKO , Koji AGA
CPC classification number: C01G49/0072 , C08K3/22 , C01P2002/32 , C01P2002/60 , C01P2004/03 , C01P2004/32 , C01P2004/51 , C01P2004/61 , C01P2004/62 , C01P2006/12 , C01P2006/40 , C08K2003/2262 , C08K2003/2275 , C08K2003/2296 , C08K2201/003
Abstract: Provided are a ferrite powder that inhibits magnetic loss at frequencies lower than 100 MHZ, and when applied to a composite material or a composite body, is capable of preventing particles from coming off without loss of moldability and filling properties, a ferrite resin composite material, and electromagnetic shielding material, electronic material, or electronic component. This ferrite powder is a Mn—Zn ferrite powder containing at least spherical or polyhedral ferrite particles having a spinel phase as a main phase. The ferrite particles also have, at respective surfaces thereof, a step structure having a convex polygonal contour. Furthermore, the BET specific surface area of the ferrite powder is 0.35-10.00 m2/g, and the contained amount of the zinc oxide (ZnO) phase thereof is 0-0.8 mass %.
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公开(公告)号：US20220340444A1
公开(公告)日：2022-10-27
申请号：US17641009
申请日：2020-10-07
Applicant: POWDERTECH CO., LTD.
Inventor： Koji AGA , Takashi KOJIMA , Takao SUGIURA , Tadashi TSUDUKI , Satomi KONNO , Sho KUWAHARA
Abstract: Provided are: a ferrite powder whereby, when the ferrite powder is applied in a composite material, dropping out of ferrite particles is suppressed without moldability and filling ability being compromised; a ferrite resin composite material; and an electromagnetic shielding material, an electronic material, or an electronic component. This ferrite powder includes at least spherical or polyhedral ferrite particles in which a step structure is provided on surfaces thereof, the step structure having a polyhedral outline in the surfaces of the ferrite particles.
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